There is disclosed a network system in which the position, attribute, and status of a desired device on a network can visually comprehensibly be grasped. A server manages location information indicating information on the device position in a hierarchical manner and attribute information from the device. Each device holds a plurality of status information (icon information) in accordance with various statuses of the device. A client holds map information corresponding to each class of the location information, and overlaps and outputs (display output) device status information obtained by communication by a polling system with the device detected by search in the server, and map information corresponding to the location information of the device.